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Why two entries for REACTION FORCE MPC Nodal

Gears Phenom Gears Phenom
Gears Phenom

Hello Experts,

there is one point I already want to know for a long time:

 

Why does exist after solving a NX simulation two entries for

- REACTION FORCE MPC NODAL and

- REACTION MOMENT MPC NODAL

in post processor module?

 

I can see differences in visualizing but is that the only one?

I had models where I could not export nodal results from RBE-connected nodes to excel in one of the entry selections as the values got quantities of 1e-10 N. I did produce "empty" simulation solutions only with constraints of user defined non-zero nodal displacement values.

 

I think there are "inner" differences, but of what kind? - Who can explain it to me?

 

With kind regards,

Michael

_____________________________________________________
| Production: NX10; Development: VB, TCL/TK, FORTRAN; Testing: NX11 | engelke engineering art GmbH, Germany
| Kudos for good posts! And if my post answers your question, please mark it as an "Accepted Solution".

6 REPLIES

Re: Why two entries for REACTION FORCE MPC Nodal

Siemens Phenom Siemens Phenom
Siemens Phenom

Nodes generally have 6 DOF. Any type of nodal boundary condition (constraint, force, etc.) will have 6 corresponding components, i.e. dx, dy, dz, rx, ry, rz. The measure on the first 3 terms is force, displacement, etc. The measure on the second 3 terms is a rotation or moment type quantity (radians, Nm, etc.)

 

Since the measures are not consistent between the first 3 dof and the second 3, NX Post splits these into two 3DOF vectors. REACTION FORCE MPC NODAL contains the X, Y and Z translational forces. REACTION MOMENT MPC NODAL contains the moments about X, Y and Z

Re: Why two entries for REACTION FORCE MPC Nodal

Gears Phenom Gears Phenom
Gears Phenom

JimB,

 

thank you for answering but this is not the point I meant.

Of course I know the difference between reaction forces and reaction moments and the necessity of separating it because of unit discrepancies.

No, I mean there are

- two entries for REACTION FORCE MPC NODAL

AND

- two entries for REACTION MOMENT MPC NODAL.

(see Picture)

 2016-09-15_RFMPCx2_001.pngPart of Post processing navigator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Its NX 8.5.2.

That's my question.  Can you explain it? - It would be gratefully.

With best regards,

Michael

_____________________________________________________
| Production: NX10; Development: VB, TCL/TK, FORTRAN; Testing: NX11 | engelke engineering art GmbH, Germany
| Kudos for good posts! And if my post answers your question, please mark it as an "Accepted Solution".

Betreff: Why two entries for REACTION FORCE MPC Nodal

Gears Phenom Gears Phenom
Gears Phenom

Hi, does no one else see 2x2 REACTION * MPC entries?

Sadly, Michael

_____________________________________________________
| Production: NX10; Development: VB, TCL/TK, FORTRAN; Testing: NX11 | engelke engineering art GmbH, Germany
| Kudos for good posts! And if my post answers your question, please mark it as an "Accepted Solution".

Betreff: Why two entries for REACTION FORCE MPC Nodal

Gears Phenom Gears Phenom
Gears Phenom

Actualization:

Momentarily I do not see both entries twice and I do not know what's the difference in modelling comparing former states. I try to figure it out.

 

Best wishes, Michael

_____________________________________________________
| Production: NX10; Development: VB, TCL/TK, FORTRAN; Testing: NX11 | engelke engineering art GmbH, Germany
| Kudos for good posts! And if my post answers your question, please mark it as an "Accepted Solution".

Betreff: Why two entries for REACTION FORCE MPC Nodal

Siemens Phenom Siemens Phenom
Siemens Phenom

I've seen this as well, but I can't reproduce it in a model I'm using currently. I don't believe that I ever reported this through an IR/PR either. If you can reproduce it, please contact GTAC as I believe it is a bug.

 

Regards,
Mark

Betreff: Why two entries for REACTION FORCE MPC Nodal

Gears Phenom Gears Phenom
Gears Phenom

Mark,

 

the world is really small!

 

I've found out, that the first one is Grid Point Reaction Force/Moment MPC - Nodal.TST_GRidPointForce_RBE_afm1_sim1_RF-N_SET-1_001.png

 

 

TST_GRidPointForce_RBE_afm1_sim1_RF-N_SET-2_001.png

 

See it in NX10.

 TST_GRidPointForce_RBE_afm1_sim1-NX10_RF-N_SET-1_001.png

 

Problem solved.

Best wishes, Micahel.

 

 

 

 

_____________________________________________________
| Production: NX10; Development: VB, TCL/TK, FORTRAN; Testing: NX11 | engelke engineering art GmbH, Germany
| Kudos for good posts! And if my post answers your question, please mark it as an "Accepted Solution".